THS3491 Datasheet, PDF (13/28 Pages) Texas Instruments – 900-MHz, High-Power Output, Current Feedback Amplifier

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THS3491
SBOS875 – AUGUST 2017
Device Functional Modes (continued)
8.4.2 Wideband, Inverting Operation
Figure 8 shows the THS3491 in a typical inverting gain configuration where the input and output impedances and
signal gain from Figure 7 are retained in an inverting circuit configuration.
15 V
50-Ÿ 6RXUFH ^RG
115
VI
RT
88.7
RF
576
49.9
0.1 …F
+
6.8 …F
±
+
THS3491
0.1 …F
49.9
50-Ÿ /RDG
+
6.8 …F
±15 V
Copyright © 2017, Texas Instruments Incorporated
Figure 8. Wideband, Inverting Gain of -5 V/V Configuration
8.4.3 Single-Supply Operation
The THS3491 can operate from a single-supply voltage ranging from 14 V to 32 V. When operating from a single
power supply, biasing the input and output at midsupply allows for the maximum output voltage swing. The
circuits shown in Figure 9 show noninverting (a) and inverting (b) amplifiers configured for single-supply
operations.
a) Noninverting Gain Configuration
+VS
+VS
2
RG
143
RF
576
0.1 …F
+
6.8 …F
50-Ÿ 6RXUFH
VI
RT
49.9
+VS
2
b) Inverting Gain Configuration
50-Ÿ 6RXUFH ^RG
115
VI
RT
88.7
+VS
2
RF
576
49.9
±
+
THS3491
49.9
50-Ÿ /RDG
15 V
0.1 …F
+
6.8 …F
±
+
THS3491
49.9
50-Ÿ /RDG
+VS
2
Copyright © 2017, Texas Instruments Incorporated
Figure 9. DC-Coupled, Single-Supply Operation
Copyright © 2017, Texas Instruments Incorporated
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